package firstcontent.metaspace;

import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.Opcodes;

/**
 * @Author: fxy
 * @Date: 2022/02/16/10:44
 * @Description:  -XX:MetaspaceSize=100m -XX:MaxMetaspaceSize=100m
 */
public class OOMTest extends ClassLoader{
    public static void main(String[] args) {
        int j = 0;
        try{
            OOMTest test = new OOMTest();
            for(int i = 0;i<10000;i++){
                //创建classWriter对象，用于生成类的二进制字节码
                ClassWriter classWriter = new ClassWriter(0);
                //指明版本号，修饰符，类名，包名，父类，接口
                classWriter.visit(Opcodes.V1_8,Opcodes.ACC_PUBLIC,"Class"+i,null,"java/lang/Object",null);
                //返回byte[]
                byte[] code = classWriter.toByteArray();
                //类的加载
                test.defineClass("Class"+i,code,0,code.length);
                j++;
            }
        }finally {
            System.out.println(j);
        }
    }
}
